Elantra XD (2001-06) :: Rough Idle And Hesitation - Stalls Sometimes
Jun 29, 2014
2002 elantra hesitates and sometimes stalls staring from rest. Worse when cold but still sluggish after warm up. Where do I start?
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Jun 29, 2014
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Hyundai - Elantra :: 2002 - Rough Idle And Misfire When Hot / Intermittent Hesitation When Accelerating
2002 Hyundai Elantra GT 2.0L 140k miles
Symptoms:
- Intermittent rough idle when hot, slight shutter, surges between 700-800rmp
- Intermittent hesitation when accelerating, cylinder 2 misfire when hot and under load
- Misfires in all gears under load, mostly when under 2000rpm
- Code P0302 when scanned, no other codes
- Symptoms appeared suddenly, not gradually over time
What's been changed:
- Replaced spark plugs, little or no improvement. Old plugs looked worn, but generally in good shape with no significant deposits.
- Cleared code and swapped injectors between cylinders 1 and 2, after test drive P0302 code came back, so it seems that the injectors are good. If the injector were bad I would have expected the misfire to change from cylinder 2 to cylinder 1.
Inspection and Testing:
- Ignition System Testing
- Spark plug wires and primary coil are within specification.
- Secondary coil resistance is high on both packs. Could this be causing a problem with just cylinder 2? Is it worth replacing?
Spark Plug Wires: Specification: 5.6 Kohm/meter +- 20%Cylinder 1: 2.49 Kohm (Longest)Cylinder 2: 2.03 KohmCylinder 3: 1.64 KohmCylinder 4:1.36 Kohm (Shortest)
Primary Coil: Specification : 0.58ohms +- 10%Actual: .6 and .6
Secondary Coil: Specification: 12.2 Kohms +- 15%
Actual (Cold): 16.03K for Cylinder 2-3 pack and 15.94K for Cylinder 1-4 pack
Actual (Hot): 18.54K for Cylinder 2-3 pack and 18.44K for Cylinder 1-4 pack
Air/Fuel System Testing:Fuel system seems to check out. I do not believe the problem is fuel related. There are no obvious cracks or leaks on the intake manifold. A good spray of Carb cleaner all around the manifold causes no change in idle. I might try propane later. No obvious vacuum leaks.
Fuel Injector: Specification: 13.1-14.5 ohms
Actual: Cyl 1: 14.9, Cyl 2: 15.3, Cyl 3: 15.3, Cyl 4: 15.7
Compression Testing:Compression is not great, but within specification. Could the slightly lower compression in Cylinders 2 and 3 indicate a head gasket leak between those cylinders? Could this cause a misfire in Cylinder 2?
Dry Compression: Specification: 145-218psi, <15psi between cylinders
Actual: Cyl 1: 165, Cyl 2: 155, Cyl 3: 155, Cyl 4: 160
Oil/Coolant/Tailpipe:
- Oil looks normal, not brown or milky
- Coolant looks normal and is full, no signs of leaking (coolant has not been changed in a very long time, could a coolant flush work?)
- Exhaust looks and smells normal from tailpipe.
Sticking valve? How would I check this? Bad sensor somewhere? Doesn't a bad sensor usually throw a code?
Elantra XD (2001-06) :: 2003 - Rough Start And Stalls On Full Tank
I just recently had a new (used) gas tank and new fuel lines (front to rear) put on the car.
On the first fill-up, I pulled out from the gas station, drove 20 seconds to the next red light. The car stalled (automatic transmission) when I came to a stop. It was hard to start and hard to keep going, and had intermittent periods of extreme power loss when I drove it down the highway.
Took it back to the shop, there was an engine code for the O2 Sensor, so the O2 was replaced, but made no difference. They checked fuel pressure and the catalytic converter, both were fine. They wanted me to keep driving it until another code came up.
As the tank neared empty, the car started driving almost perfectly. Filled it up again, and the problems started all over again. I have tried driving it with the gas cap off to make sure air can get in to replace the gas, but made no difference.
I changed the spark plugs, and all 4 of the old ones were covered in black carbon from the fuel running too rich (i assume).
Also, when the car is idling and it starts struggling, the exhaust does smell extremely strongly and is grey.
Now, engine code [P1166 O2S Controller Adaption Diagnosis Malfunction (bank 1)] is appearing (I have to check with the garage monday to see if it is the same code they had earlier).
I'm not sure why a new tank would cause this, unless somehow dirt/rust ended up where it didn't belong during the changeover.
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I have changed the spark plugs and wires, the fuel pump, the crankshaft position sensor (was fried) and after consulting this forum, I checked the fuel pressure regulator and the diaphragm is not leaking.
I was able to recreate the rough idle and the CEL on the dash, but my two OBDII readers said there were no codes And the bluetooth reader I am using is indicating that the following tests are not completing: Fuel System, Catalyst, Evaporative System and Oxygen Senors.
The dash CEL resets itself upon restart and does not light until the symptoms return.
After reading the Haynes Repair Manual, I am wondering about the Evaporative Emissions Control (EVAP) system? But I don't want to lead the troubleshooting.
We bought the vehicle at 60K miles and it has been mostly reliable.
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I've noticed a lot of other Hyundai's have the same issue. What would be/is the most COMMON cause of this? Timing belt? Basic tune up? I moved a state away from my local shop and I refuse to go to a Midas/Jiffy/ect.
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Also the engine makes a ticking noise from a cold start up. It stops making the ticking noise after 1500rpm or when the engine warms up.
Occasionally the car has a sputtering backfire. This happens when I park the car after being on the highway.
Replaced the plugs, wires, and the pcv valve. Dropped the oil pan and it and the oil pump pick up screen were clean.
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I have a 2001 Elantra with 170K miles. well taken care of. I've been having a rough idle issue for some time now. The car idles very rough. I checked for codes and I got the cylinder 2 misfire code (P0302)...
I started out and replaced the plugs and wires, no solution...
I replaced the coil packs, no solution...
I replaced the MAP sensor, no solution...
I figured it may be no to low compression, so I did a compression test and all cylinders came back normal, still no solution...
I figured it might be a dirty injector, so I poured some seafoam in the gas tank, and no solution...
So my next step is to switch out the injector. Is there anything I am overlooking?
Here's the big thing that is happening too... Everytime I fill up the gas tank, I turn the car on and it idles even rougher. Like if you talk while sitting in the car, you sound like Chevy Chase when he is on the vibrating bed with Beverly D'Angelo in the movie vacation! LOL. It slowly goes away after 10-15 minutes of driving. All this rough running engine ONLY happens at idle, otherwise it runs very smoothly.
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I own a 2004 Pontiac Grand Am V6... recently it has developed a rough idle - kind of like the car is hiccuping - and it hesitates when I accelerate from a stop. Now, it doesn't have issues changing gears so I'm not inclined to believe its a transmission issue...thought it might be the fuel filter, but I changed it and that did nothing.. I'm not getting a check engine light, which is frustrating because if I try to pull the codes it won't throw me any... so it's a guessing game now. I've gotten mixed reviews - anything from a bad catalytic converter to a faulty O2 sensor or idle air controller or a bad head gasket.. but my exhaust is completely clean...others say maybe its bad spark plug wires or other electrical issue (which is a whole other ball game) or possibly bad fuel injectors causing a misfire?
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